Analysis and design of an ultra-high-speed slotless self-bearing permanent-magnet motor

Baumgärtner, Thomas; Burkart, Ralph M.; Kolar, Johann W.

doi:10.1109/iecon.2012.6389464

Cited by 8 publications

(2 citation statements)

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“…Hence, integration into the active region of the motor is straightforward with an additional air-gap winding for the damper and yields a very compact design [6]. Clearly, by integrating the damper into the active region of the motor, the torque capability of the machine is reduced.…”

Section: Hybrid Bearing Conceptmentioning

confidence: 97%

“…For active magnetic bearings, very high speed operation has been demonstrated with a self-bearing permanent-magnet motor design at rotational speed of up to 400 kr/min [6], which in recent achievements could be further increased to 505 kr/min [7]. Aside from the possibility for high-speed operation, one of the main benefits of active magnetic bearings is also their capability of active vibration control of structural resonance [8], which can allow operation at speeds beyond the rotor's natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

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An Active Magnetic Damper Concept for Stabilization of Gas Bearings in High-Speed Permanent-Magnet Machines

Looser

Kolar

2014

IEEE Trans. Ind. Electron.

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The successful application of ultrahigh-speed electrical-drive systems in industrial products is currently limited by lacking high-speed bearing technologies permitting high reliability and long lifetime. Promising bearing technologies for high rotational speeds are contactless bearing concepts such as active magnetic bearings or gas bearings. While magnetic bearings usually are major electromechanical systems with substantial complexity, gas bearings allow compact realizations with high load capacity and stiffness; however, poor dynamic stability has been limiting their use at high rotational speeds. Following a hybrid bearing approach with an aerodynamic gas bearing for load support, a small-sized active magnetic damper concept is proposed to enable the stable high-speed operation of the gas bearing with a minimum of additional complexity and costs. As for the effective stabilization of the gas bearing, a high-quality displacement measurement is essential, and a new eddy-current-based rotordisplacement self-sensing concept employing an auxiliary signal injection and rotor displacement measurement circuit is presented. A hardware implementation of the proposed concept is shown providing high-resolution measurement signals.Index Terms-Active magnetic damper, high-speed permanentmagnet machines, signal injection self-sensing, vibration control.

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Section: Hybrid Bearing Conceptmentioning

confidence: 97%